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Full text of "The manufacture and properties of iron and steel"

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156                        METALLUEGY OF IRON AND STEEL.
Heat in producer gases used, at 655
Dry gas 874 c. m.  (874x0.347x655), calories___..........     92,650
Steam 33 c. m. (33x0.440x655)..........................       9,510
Total, calories ......................................   102,160
Total heat brought to furnace, not available, calories.....   238,580
Heat taken out in chimney gases, at 680
Dry, theoretical combustion (1472x0.367x680), calories...   367,750
Steam formed (168x0.444x680), calories..................    50,190
Total in theoretical products of combustion, calories,.   417,940 In excess air used (680x0.324x680), calories.........   149,820
Total in the chimney gases, calories..............   567,760
Heat brought to furnace and not available, calories...........   238,580
Heat loss in chimney chargeable against furnace, calories.....   329,180
Proportion of chimney loss chargeable against furnace, per
cent....................................................          58
i Items of Chimney Loss Chargeable Against Furnace:
Calories.          Per cent.
Dry gases from theoretical combustion........   213,220                   64.8
Steam from theoretical combustion............     29,100                     8.8
Excess air used ..............................     86,860                   26.4
329,180                 100.0
Summary of Above Besults on Furnace Practice per 300 kg. Coal =0ne Ton Steel.
Calories.
Potential value of gas...................................... 1,101,240
Combustion of metalloids...................................     155,000
Total heat available.................................... 1,256,240
Sensible Heat in Waste Gases Chargeable Against the Furnace.
Per cent, of available Calories.       energy.
(a)  Dry, theoretical products of combustion-----   213,220           17.0
(b)   Steam of theoretical products of combustion.    29,100            2.3
Total in the theoretical products of combustion..   242,320           19.3
(c)  Excess air used...........................     86,860             6.9
Total in entire products of combustion......   329,180           26.2
Heating and melting stock......................   310,000           24.7
Radiation and conduction (by difference).......   617,060           49.1
Total, as above.............................1,256,240         100.0